Apple's custom low-overhead protocol for ad-hoc networking of Macintosh computers and their printers.
Apple continues to support AppleTalk in OS X, however it has been depricated in favor of TCP/IP and Zero-Conf (aka Rendezvous)
Reference:
Gursharan S., Andrews, R., and A. Oppenheimer, 
"Inside AppleTalk", Second Edition, Addison Wesley, 1990.
